While exploring paldo, the impression I got was of a small project that had started as an experiment (perhaps showcasing Upkg) and then never quite achieved critical mass. That is, the project did not seem to attract more developers, packagers or even a large number of users. The project continues to push out regular releases and its software it up to date, but paldo gives the impression it has not been completed, that the distribution is on auto-pilot. The installer, documentation and small software repository suggest development has not been able to move forward in recent years.
Which is too bad. Upkg, seems like a capable package manager and the distribution's packages are cutting-edge. The rolling release model combined with the multiple tiers of development branches would seem to be a good foundation upon which to build. I think paldo has potential, but may be stuck in a catch-22 situation where more developers are needed to make the distribution a practical solution for most users and paldo needs to attract new users who can become contributors to the project.
As it stands, the project's wiki feels unfinished and the forums are quiet. The paldo distribution continues to work and continues to push out regular software updates, but I think the distribution needs an influx of contributors to round out what the developers have created thus far.